| Country | Period | River Stations | Very negative | Marginally negative | No change | Marginally positive | Very positive | Sen slope (mg O2/l) | Sen slope (%) |
|---|---|---|---|---|---|---|---|---|---|
| Europe | 1992-2017 | 484 | 320 | 22 | 114 | 5 | 23 | -0.068 | -2.504 |
| Austria | 1992-2017 | 46 | 26 | 2 | 17 | 1 | 0 | -0.036 | -2.165 |
| Belgium | 1992-2017 | 26 | 9 | 0 | 10 | 1 | 6 | -0.032 | -0.719 |
| Bulgaria | 1992-2017 | 58 | 37 | 3 | 18 | 0 | 0 | -0.152 | -3.029 |
| Czechia | 1992-2017 | 19 | 14 | 0 | 5 | 0 | 0 | -0.075 | -1.949 |
| Estonia | 1992-2017 | 38 | 8 | 2 | 20 | 0 | 8 | -0.004 | -0.159 |
| Finland | 1992-2017 | 5 | 3 | 1 | 0 | 1 | 0 | -0.016 | -1.177 |
| France | 1992-2017 | 181 | 152 | 7 | 17 | 1 | 4 | -0.076 | -3.709 |
| Ireland | 1992-2017 | 3 | 3 | 0 | 0 | 0 | 0 | -0.044 | -3.108 |
| Latvia | 1992-2017 | 15 | 8 | 3 | 3 | 0 | 1 | -0.017 | -1.103 |
| Lithuania | 1992-2017 | 24 | 16 | 0 | 4 | 1 | 3 | -0.053 | -1.515 |
| North Macedonia | 1992-2017 | 9 | 3 | 2 | 4 | 0 | 0 | -0.116 | -1.645 |
| Slovakia | 1992-2017 | 12 | 11 | 1 | 0 | 0 | 0 | -0.076 | -2.309 |
| Slovenia | 1992-2017 | 9 | 8 | 0 | 1 | 0 | 0 | -0.111 | -4.414 |
| Spain | 1992-2017 | 13 | 2 | 0 | 11 | 0 | 0 | -0.057 | -0.9 |
| Sweden | 1992-2017 | 1 | 0 | 0 | 1 | 0 | 0 | -0.017 | -0.288 |
| United Kingdom | 1992-2017 | 25 | 20 | 1 | 3 | 0 | 1 | -0.022 | -1.654 |
| Europe | 2000-2017 | 896 | 389 | 63 | 355 | 28 | 61 | -0.05 | -1.96 |
| Austria | 2000-2017 | 48 | 7 | 1 | 28 | 3 | 9 | -0.003 | 0.213 |
| Belgium | 2000-2017 | 36 | 10 | 1 | 11 | 3 | 11 | 0.002 | 0.697 |
| Bulgaria | 2000-2017 | 75 | 25 | 6 | 38 | 2 | 4 | -0.087 | -1.952 |
| Croatia | 2000-2017 | 23 | 15 | 1 | 6 | 0 | 1 | -0.066 | -3.451 |
| Cyprus | 2000-2017 | 4 | 1 | 1 | 1 | 0 | 1 | 0.019 | -1.259 |
| Czechia | 2000-2017 | 19 | 8 | 2 | 9 | 0 | 0 | -0.058 | -1.812 |
| Estonia | 2000-2017 | 41 | 2 | 2 | 23 | 4 | 10 | 0.005 | 0.439 |
| Finland | 2000-2017 | 5 | 2 | 0 | 3 | 0 | 0 | -0.041 | -2.295 |
| France | 2000-2017 | 245 | 161 | 24 | 55 | 3 | 2 | -0.062 | -4.01 |
| Ireland | 2000-2017 | 52 | 16 | 4 | 31 | 0 | 1 | -0.019 | -1.433 |
| Latvia | 2000-2017 | 18 | 14 | 2 | 2 | 0 | 0 | -0.043 | -2.879 |
| Lithuania | 2000-2017 | 24 | 11 | 1 | 9 | 3 | 0 | -0.043 | -1.549 |
| North Macedonia | 2000-2017 | 19 | 13 | 2 | 4 | 0 | 0 | -0.305 | -4.787 |
| Poland | 2000-2017 | 92 | 37 | 6 | 46 | 1 | 2 | -0.045 | -1.412 |
| Romania | 2000-2017 | 99 | 39 | 6 | 46 | 1 | 7 | -0.067 | -1.52 |
| Slovakia | 2000-2017 | 12 | 3 | 1 | 8 | 0 | 0 | -0.043 | -1.388 |
| Slovenia | 2000-2017 | 11 | 10 | 0 | 1 | 0 | 0 | -0.126 | -6.803 |
| Spain | 2000-2017 | 38 | 4 | 1 | 17 | 5 | 11 | 0.024 | 2.73 |
| Sweden | 2000-2017 | 1 | 0 | 0 | 1 | 0 | 0 | 0.004 | 0.061 |
| United Kingdom | 2000-2017 | 34 | 11 | 2 | 16 | 3 | 2 | -0.015 | -0.814 |